EdgeVoiceAI

A modular, full-duplex conversational voice AI framework for Python 3.10+
Built for edge devices (Raspberry Pi, Linux) and laptops (macOS, Windows) powered by Google Gemini Live.

🌟 Overview

EdgeVoiceAI is a developer-first Python library designed to build low-latency, full-duplex conversational voice assistants from scratch. It connects physical hardware microphones and speakers directly with Google Gemini's real-time bidirectional streaming API (bidiGenerateContent), enabling natural spoken interactions with instant turn-taking and conversational barge-in interruptions.

Unlike traditional voice wrappers that chain disjointed Speech-To-Text (STT) $\rightarrow$ LLM $\rightarrow$ Text-To-Speech (TTS) pipelines with noticeable latency, EdgeVoiceAI operates over a single, continuous, bidirectional audio WebSocket connection.

🏗️ Architecture

+-----------------------------------------------------------------------+
|        Client Device (macOS / Linux / Windows / Raspberry Pi)         |
|                                                                       |
|   [🎙️ MicrophoneStream (16kHz Native Mono PCM)]                       |
|                │                                                      |
|                ▼                                                      |
|   [⚡ VoiceActivityDetector (Energy Gating & Syllable Onset)]          |
|                │                                                      |
|                ▼                                                      |
|   [📤 WebSockets Client (realtimeInput audio frames)]                 |
|                │                                      ▲               |
+────────────────┼──────────────────────────────────────┼───────────────+
                 │                                      │
                 │ 16kHz PCM Stream                     │
                 ▼                                      │
+───────────────────────────────────────────────────────┼───────────────+
|                  Google Gemini Live Service           │               |
|                 (gemini-2.0-flash-exp / live)         │               |
+───────────────────────────────────────────────────────┼───────────────+
                 │                                      │
                 │ 24kHz Streaming Audio & Tool Calls   │
                 ▼                                      │
+────────────────┼──────────────────────────────────────┼───────────────+
|                ▼                                                      |
|   [📥 WebSockets Receiver (serverContent)]                            |
|          │                                                            |
|          ├─────────────────────────────┐                              |
|          ▼                             ▼                              |
|   [🔊 AudioPlayer (24kHz PCM)]   [🔧 Tool Dispatcher (ToolRegistry)]  |
|    • <50ms Instant Barge-In Cancel             │                      |
|    • Acoustic Echo Suppression                 ▼                      |
|                                  [🧠 Memory & Vector Stores]          |
|                                     (SQLite / Qdrant / Pinecone)      |
+-----------------------------------------------------------------------+

✨ Key Features

• ⚡ Ultra-Low Latency & Instant Barge-In: Real-time 16kHz continuous streaming. When you speak while the assistant responds, playback clears instantly (<50ms) to yield the floor naturally.
• 🧩 Self-Describing Tools with Prompt Composition: Each tool declares its own JSON schema, execution callback, and prompt etiquette instructions (prompt_instruction). The framework automatically synthesizes these instructions into the agent's system prompt.
• 🎙️ Cross-Platform Audio Engine: Powered by PortAudio with automatic hardware enumeration across macOS (CoreAudio), Linux / Raspberry Pi (ALSA/PulseAudio), and Windows (WASAPI/MME).
• 🔍 Plug-and-Play RAG Integration: Built-in RAGRetriever with chunking and native vector store backends for InMemoryVectorStore, QdrantVectorStore, and PineconeVectorStore.
• 🛡️ Conversational Guardrails: Turn-aware farewell detectors, topic safety guards, and entity memory management.
• 📲 Built-in Notification Tools: Two-turn confirmation WhatsApp dispatch tool with phone number normalization.

📦 Installation

1. Install System Audio Dependencies (PortAudio)

EdgeVoiceAI uses PortAudio for native, cross-platform audio streaming.

• macOS:

  brew install portaudio
  

• Linux / Raspberry Pi:

  sudo apt-get update
  sudo apt-get install -y portaudio19-dev libasound2-dev python3-pyaudio
  

• Windows: Pre-compiled wheels are included automatically via pyaudio.

2. Install EdgeVoiceAI via pip

# Core package
pip install edgevoiceai

# With specific optional extras
pip install "edgevoiceai[qdrant]"    # Qdrant vector store support
pip install "edgevoiceai[pinecone]"  # Pinecone vector store support
pip install "edgevoiceai[media]"     # Pygame audio sound effects

# Or install all extras
pip install "edgevoiceai[all]"

🚀 5-Minute Quickstart

1. Set Your Gemini API Key

export GEMINI_API_KEY="your-google-ai-studio-api-key"

2. Run a Full-Duplex Voice Assistant

import asyncio
import os
from dotenv import load_dotenv
from edgevoiceai import (
    BaseTool,
    InMemoryMemoryStore,
    ToolExecutionContext,
    ToolRegistry,
    ToolResult,
    VoiceAgent,
    VoiceConfig,
)

# Load GEMINI_API_KEY from .env
load_dotenv()


# Define a custom tool with prompt instructions
class BookAppointmentTool(BaseTool):
    @property
    def name(self) -> str:
        return "book_appointment"

    @property
    def description(self) -> str:
        return "Schedules a consultation appointment for the user."

    @property
    def parameters_schema(self) -> dict:
        return {
            "type": "object",
            "properties": {
                "name": {"type": "string", "description": "Customer name"},
                "date": {"type": "string", "description": "Date of appointment (YYYY-MM-DD)"},
                "time": {"type": "string", "description": "Time (e.g. 10:00 AM)"},
            },
            "required": ["name", "date", "time"],
        }

    @property
    def prompt_instruction(self) -> str:
        return (
            "When scheduling, ask for the customer's name, desired date, and preferred time. "
            "Always verbally confirm all details before executing book_appointment."
        )

    async def execute(self, params: dict, context: ToolExecutionContext) -> ToolResult:
        name = params.get("name")
        date = params.get("date")
        time = params.get("time")
        # In a real app, write to database or calendar API
        return ToolResult(
            status="success",
            message=f"Appointment booked for {name} on {date} at {time}.",
            data={"status": "confirmed", "booking_id": "APT-1001"},
        )


async def main():
    api_key = os.environ.get("GEMINI_API_KEY")
    if not api_key:
        raise ValueError("Please set the GEMINI_API_KEY environment variable.")

    # Configure the voice session
    config = VoiceConfig(
        api_key=api_key,
        voice="Puck",  # Puck, Charon, Aoede, Fenrir, Kore
        system_instruction=(
            "You are a friendly, concise voice assistant. "
            "Keep responses natural, conversational, and direct."
        ),
    )

    # Register tools and memory
    registry = ToolRegistry()
    registry.register(BookAppointmentTool())
    memory = InMemoryMemoryStore()

    agent = VoiceAgent(config=config, tools=registry, memory=memory)

    print("🎙️ Starting Voice Assistant... Speak into your microphone!")
    try:
        await agent.run_edge()
    except KeyboardInterrupt:
        print("\nStopping...")
    finally:
        agent.stop()


if __name__ == "__main__":
    asyncio.run(main())

📖 Documentation

Comprehensive documentation, tutorials, architecture deep-dives, and API references are available at: https://merhasmukh.github.io/edgevoiceai/

📄 License

This project is licensed under the MIT License.